From: "H. Peter Anvin" <hpa@zytor.com>
To: Dan Upton <upton.dan.linux@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: rdmsr_safe_on_cpu hangs?
Date: Tue, 26 Feb 2008 22:51:12 -0800 [thread overview]
Message-ID: <47C50860.2050108@zytor.com> (raw)
In-Reply-To: <ba7d8f720802261358h31e30308ob4d99e05a34cf584@mail.gmail.com>
Dan Upton wrote:
>
> I guess the question is, am I just misunderstanding the use of
> rdmsr_safe_on_cpu, or is it an issue with that particular MSR (some of
> the stuff I've read indicates that rdmsr_safe was really only
> implemented as a prequel to the coretemp driver), or is it something
> wrong with rdmsr_safe_on_cpu?
>
*msr_safe_*() can only trap #GP's, which would be manifest as oopses if
you used the unsafe versions. If the CPU *hangs* when touching an MSR,
nothing we can do in software will help.
-hpa
prev parent reply other threads:[~2008-02-27 6:51 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-26 21:58 rdmsr_safe_on_cpu hangs? Dan Upton
2008-02-27 6:51 ` H. Peter Anvin [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=47C50860.2050108@zytor.com \
--to=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=upton.dan.linux@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox